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| Section | Weight | Objectives |
|---|---|---|
| WLAN Medium Access | 10% | - Medium access performance analysis - Contention and coordination functions - CSMA/CA and medium access rules - Medium access related issues |
| PHY Layers and Technologies | 10% | - PHY layer troubleshooting - Modulation and coding schemes - Channelization and frequency usage - 802.11 physical layer standards |
| Protocol Analysis | 15% | - Analysis tools and methods - Capture and decode process - Troubleshooting using protocol data - Protocol analysis fundamentals |
| MAC Sublayer and Functions | 25% | - MAC frame formats and types - MAC layer troubleshooting - MAC addressing and operations - QoS and power management |
| 802.11 Frame Exchanges | 30% | - Data transfer and protection mechanisms - Frame exchange troubleshooting - Association and authentication processes - Frame exchange sequences |
| Spectrum Analysis | 10% | - Troubleshooting RF issues - RF spectrum fundamentals - Spectrum analysis tools - Interference detection and classification |
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137. Frage
When performing protocol analysis, you capture an 802.1 lac data frame on channel 52, transmitted at MCS 8.
At what data rate was the PHY Preamble transmitted?
Antwort: A
Begründung:
The data rate at which the PHY preamble was transmitted is 6 Mbps. The PHY preamble is a part of the PPDU that is transmitted before the PHY header and the PSDU. The PHY preamble consists of a series of training fields that help the receiver to detect and synchronize with the signal. The PHY preamble is always transmitted at a fixed data rate that depends on the type of PPDU (e.g., OFDM, HT, VHT, HE). For an 802.1 lac data frame on channel 52, which uses VHT PPDUs, the data rate for the PHY preamble is 6 Mbps. This data rate does not depend on MCS (Modulation and Coding Scheme), which only affects the data rate for the PSDU. References: [Wireless Analysis Professional Study Guide CWAP-405], Chapter 4: 802.11 Physical Layer, page 99-100
138. Frage
You are troubleshooting throughput problems for a WLAN cell. The cell is provisioned with an 802.11ac dual- band AP. Users connected with both 5 GHz and 2.4 GHz connections are reporting performance problems.
The AP settings are properly optimized. No interface issues have been detected (either co-channel interference or non-Wi-Fi interference) and the number of associated users is low.
What should you analyze to resolve the issue?
Antwort: B
139. Frage
Which one of the following is not an 802.11 Management frame?
Antwort: D
Begründung:
A PS-Poll (Power Save Poll) frame is not an 802.11 management frame. A PS-Poll frame is a type of control frame that is used by a STA in power save mode to request data frames from an AP. A STA in power save mode can conserve battery power by periodically sleeping and waking up. When a STA sleeps, it cannot receive any data frames from the AP, so it informs the AP of its power save status by setting a bit in its MAC header. The AP then buffers any data frames destined for the sleeping STA until it wakes up. When a STA wakes up, it sends a PS-Poll frame to the AP, indicating its association ID and requesting any buffered data frames. The AP then responds with one or more data frames, followed by an ACK or BA frame from the STA. The other options are not correct, as they are types of 802.11 management frames. An Action frame is used to perform various management actions, such as spectrum management, QoS management, radio measurement, etc. A Beacon frame is used to advertise the presence and capabilities of an AP or BSS. An Authentication frame is used to establish or terminate an authentication relationship between a STA and an AP. References: [Wireless Analysis Professional Study Guide CWAP-405], Chapter 6: 802.11 Frame Exchanges, page 169-170
140. Frage
802.11k Neighbor Requests and Neighbor Reports are sent in what type of Management Frames?
Antwort: B
Begründung:
802.11k Neighbor Requests and Neighbor Reports are sent in Action frames. An Action frame is a Management frame that is used to perform various operations or functions related to the operation or maintenance of a wireless network. An Action frame consists of a Category field that indicates the type of action being performed, and a variable-length Action Details field that contains specific information related to the action. For example, an Action frame with a Category field value of 5 indicates a Radio Measurement action, and the Action Details field may contain a Neighbor Request or a Neighbor Report subelement .
References: CWAP-405Certified Wireless Analysis Professional Study and Reference Guide, Chapter 6:
MAC Sublayer Frame Exchanges, page 207; CWAP-405Certified Wireless Analysis Professional Study and Reference Guide, Chapter 6: MAC Sublayer Frame Exchanges, page 208; CWAP-405Certified Wireless Analysis Professional Study and Reference Guide, Chapter 12: 802.11k/v/r/u/w/ai Amendments, page 434.
141. Frage
Why would a STA that supports 802.11k Radio Measurement send a Neighbor Request to an AP?
Antwort: A
Begründung:
An 802.11k-capable station sends a Neighbor Request to obtain a Neighbor Report from the AP.
This report contains information about nearby APs, including their BSSIDs, channels, and capabilities, allowing the station to build an informed roaming candidate list and reduce scan time during roaming decisions.
142. Frage
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